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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: AbstractUpdatingDataSource.html 689 2013-06-28 19:22:16Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.schema;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.io.PrintWriter;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.sql.Connection;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.sql.SQLException;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.sql.SQLFeatureNotSupportedException;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.logging.Logger;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>import javax.sql.DataSource;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>/**<a name="line.18"></a>
<span class="sourceLineNo">019</span> * A {@link DataSource} that wraps an inner {@link DataSource} and automatically performs some update<a name="line.19"></a>
<span class="sourceLineNo">020</span> * operation on the inner {@link DataSource} on first access.<a name="line.20"></a>
<span class="sourceLineNo">021</span> *<a name="line.21"></a>
<span class="sourceLineNo">022</span> * &lt;p&gt;<a name="line.22"></a>
<span class="sourceLineNo">023</span> * The {@link #setDataSource dataSource} property is required.<a name="line.23"></a>
<span class="sourceLineNo">024</span> */<a name="line.24"></a>
<span class="sourceLineNo">025</span>public abstract class AbstractUpdatingDataSource implements DataSource {<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>    private DataSource dataSource;<a name="line.27"></a>
<span class="sourceLineNo">028</span>    private boolean updated;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    /**<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * Configure the underlying {@link DataSource}. Required property.<a name="line.31"></a>
<span class="sourceLineNo">032</span>     */<a name="line.32"></a>
<span class="sourceLineNo">033</span>    public void setDataSource(DataSource dataSource) {<a name="line.33"></a>
<span class="sourceLineNo">034</span>        this.dataSource = dataSource;<a name="line.34"></a>
<span class="sourceLineNo">035</span>    }<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>    /**<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * Update the inner {@link DataSource}.<a name="line.38"></a>
<span class="sourceLineNo">039</span>     *<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * &lt;p&gt;<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * This method will be invoked at most once.<a name="line.41"></a>
<span class="sourceLineNo">042</span>     */<a name="line.42"></a>
<span class="sourceLineNo">043</span>    protected abstract void updateDataSource(DataSource dataSource) throws SQLException;<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>    /**<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * Get the underlying {@link DataSource}.<a name="line.46"></a>
<span class="sourceLineNo">047</span>     */<a name="line.47"></a>
<span class="sourceLineNo">048</span>    protected DataSource getInnerDataSource() {<a name="line.48"></a>
<span class="sourceLineNo">049</span>        return this.dataSource;<a name="line.49"></a>
<span class="sourceLineNo">050</span>    }<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>    /**<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * Determine if the underlying {@link DataSource} has been updated.<a name="line.53"></a>
<span class="sourceLineNo">054</span>     *<a name="line.54"></a>
<span class="sourceLineNo">055</span>     * &lt;p&gt;<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * If the update is currently happening in another thread, the current thread will<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * block until the update operation finishes.<a name="line.57"></a>
<span class="sourceLineNo">058</span>     */<a name="line.58"></a>
<span class="sourceLineNo">059</span>    protected synchronized boolean isUpdated() {<a name="line.59"></a>
<span class="sourceLineNo">060</span>        return this.updated;<a name="line.60"></a>
<span class="sourceLineNo">061</span>    }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>    // DataSource methods<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    @Override<a name="line.65"></a>
<span class="sourceLineNo">066</span>    public Connection getConnection() throws SQLException {<a name="line.66"></a>
<span class="sourceLineNo">067</span>        return this.getUpdatedDataSource().getConnection();<a name="line.67"></a>
<span class="sourceLineNo">068</span>    }<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span>    @Override<a name="line.70"></a>
<span class="sourceLineNo">071</span>    public Connection getConnection(String username, String password) throws SQLException {<a name="line.71"></a>
<span class="sourceLineNo">072</span>        return this.getUpdatedDataSource().getConnection(username, password);<a name="line.72"></a>
<span class="sourceLineNo">073</span>    }<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>    @Override<a name="line.75"></a>
<span class="sourceLineNo">076</span>    public PrintWriter getLogWriter() throws SQLException {<a name="line.76"></a>
<span class="sourceLineNo">077</span>        return this.getUpdatedDataSource().getLogWriter();<a name="line.77"></a>
<span class="sourceLineNo">078</span>    }<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span>    @Override<a name="line.80"></a>
<span class="sourceLineNo">081</span>    public void setLogWriter(PrintWriter pw) throws SQLException {<a name="line.81"></a>
<span class="sourceLineNo">082</span>        this.getUpdatedDataSource().setLogWriter(pw);<a name="line.82"></a>
<span class="sourceLineNo">083</span>    }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>    @Override<a name="line.85"></a>
<span class="sourceLineNo">086</span>    public void setLoginTimeout(int timeout) throws SQLException {<a name="line.86"></a>
<span class="sourceLineNo">087</span>        this.getUpdatedDataSource().setLoginTimeout(timeout);<a name="line.87"></a>
<span class="sourceLineNo">088</span>    }<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>    @Override<a name="line.90"></a>
<span class="sourceLineNo">091</span>    public int getLoginTimeout() throws SQLException {<a name="line.91"></a>
<span class="sourceLineNo">092</span>        return this.getUpdatedDataSource().getLoginTimeout();<a name="line.92"></a>
<span class="sourceLineNo">093</span>    }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>    @Override<a name="line.95"></a>
<span class="sourceLineNo">096</span>    public &lt;T&gt; T unwrap(Class&lt;T&gt; cl) throws SQLException {<a name="line.96"></a>
<span class="sourceLineNo">097</span>        return cl.cast(this.getUpdatedDataSource());<a name="line.97"></a>
<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span>    @Override<a name="line.100"></a>
<span class="sourceLineNo">101</span>    public boolean isWrapperFor(Class&lt;?&gt; cl) throws SQLException {<a name="line.101"></a>
<span class="sourceLineNo">102</span>        return cl.isInstance(this.getUpdatedDataSource());<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>    //@Override (Java7)<a name="line.105"></a>
<span class="sourceLineNo">106</span>    public Logger getParentLogger() throws SQLFeatureNotSupportedException {<a name="line.106"></a>
<span class="sourceLineNo">107</span>        try {<a name="line.107"></a>
<span class="sourceLineNo">108</span>            return (Logger)DataSource.class.getMethod("getParentLogger").invoke(this.getUpdatedDataSource());<a name="line.108"></a>
<span class="sourceLineNo">109</span>        } catch (Exception e) {<a name="line.109"></a>
<span class="sourceLineNo">110</span>            throw new SQLFeatureNotSupportedException(e);<a name="line.110"></a>
<span class="sourceLineNo">111</span>        }<a name="line.111"></a>
<span class="sourceLineNo">112</span>    }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span>    // Internal methods<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>    private synchronized DataSource getUpdatedDataSource() throws SQLException {<a name="line.116"></a>
<span class="sourceLineNo">117</span>        if (!this.updated) {<a name="line.117"></a>
<span class="sourceLineNo">118</span>            if (this.dataSource == null)<a name="line.118"></a>
<span class="sourceLineNo">119</span>                throw new IllegalArgumentException("no DataSource configured");<a name="line.119"></a>
<span class="sourceLineNo">120</span>            this.updateDataSource(this.dataSource);<a name="line.120"></a>
<span class="sourceLineNo">121</span>            this.updated = true;<a name="line.121"></a>
<span class="sourceLineNo">122</span>        }<a name="line.122"></a>
<span class="sourceLineNo">123</span>        return this.dataSource;<a name="line.123"></a>
<span class="sourceLineNo">124</span>    }<a name="line.124"></a>
<span class="sourceLineNo">125</span>}<a name="line.125"></a>
<span class="sourceLineNo">126</span><a name="line.126"></a>




























































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